Qi Yijun, Chang Chenliang, Xia Jun
Opt Express. 2016 Dec 26;24(26):30368-30378. doi: 10.1364/OE.24.030368.
The purpose of this study is to implement speckle reduced three-dimensional (3-D) holographic display by single phase-only spatial light modulator (SLM). The complex amplitude of hologram is transformed to pure phase value based on double-phase method. To suppress noises and higher order diffractions, we introduced a 4-f system with a filter at the frequency plane. A blazing grating is proposed to separate the complex amplitude on the frequency plane. Due to the complex modulation, the speckle noise is reduced. Both computer simulation and optical experiment have been conducted to verify the effectiveness of the method. The results indicate that this method can effectively reduce the speckle in the reconstruction in 3-D holographic display. Furthermore, the method is free of iteration which allows improving the image quality and the calculation speed at the same time.
本研究的目的是通过仅使用单相空间光调制器（SLM）来实现散斑减少的三维（3-D）全息显示。基于双相位方法，全息图的复振幅被转换为纯相位值。为了抑制噪声和高阶衍射，我们在频谱平面引入了一个带有滤波器的4-f系统。提出了一种闪耀光栅来分离频谱平面上的复振幅。由于复调制，散斑噪声得以降低。我们进行了计算机模拟和光学实验来验证该方法的有效性。结果表明，该方法能够有效减少三维全息显示重建中的散斑。此外，该方法无需迭代，可同时提高图像质量和计算速度。
